How jQuery UI Works

jQuery UI contains many widgets that maintain state and therefore may have a slightly different usage pattern than typical jQuery plugins you are already used to. While the initialization is the same as most jQuery plugins, jQuery UI's widgets are built on top of the Widget Factory which provides the same general API to all … Continue reading

How jQuery Works

link jQuery: The BasicsThis is a basic tutorial, designed to help you get started using jQuery. If you don't have a test page setup yet, start by creating the following HTML page: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 <!doctype html><html><head> <meta charset="utf-8"> <title>Demo</title></head><body> <a href="http://jquery.com/">jQuery</a> … Continue reading

How To Use the Widget Factory

To start, we'll create a progress bar that just lets us set the progress once. As we can see below, this is done by calling jQuery.widget() with two parameters: the name of the plugin to create, and an object literal containing functions to support our plugin. When our plugin gets called, it will create a … Continue reading

How to Create a Basic Plugin

Sometimes you want to make a piece of functionality available throughout your code. For example, perhaps you want a single method you can call on a jQuery selection that performs a series of operations on the selection. In this case, you may want to write a plugin. link How jQuery Works 101: jQuery Object MethodsBefore … Continue reading

Contributing

Depending on your level of experience with some of the workflows common to many open source projects, e.g. git/GitHub, the command line, and setting up a local development environment, contributing to this site may be a breeze or come with a bit of a learning curve. If you fit into the former group, great! Jump … Continue reading

About This Site

Learning how and when to use jQuery is a different process for each and every web developer, depending largely on experience with the primary tools for front-end development (HTML, CSS, and JavaScript) and knowledge of general programming principles. Over the years developers of all stripes have come to rely on our API documentation for help … Continue reading

Extending Widgets with the Widget Factory

jQuery UI's widget factory makes it easy to build widgets that extend the functionality of existing widgets. Doing so allows you to build powerful widgets on top of an existing base, as well as make small tweaks to an existing widget's functionality. Note: This article assumes some basic knowledge of what the widget factory is … Continue reading

How do I select an item using class or ID?

This code selects an element with an ID of "myDivId". Since IDs are unique, this expression always selects either zero or one elements depending upon whether or not an element with the specified ID exists. 1 $( "#myDivId" ); This code selects an element with a class of "myCssClass". Since any number of elements can … Continue reading

How do I test whether an element exists?

Use the .length property of the jQuery collection returned by your selector: 1 2 3 4 5 if ( $( "#myDiv" ).length ) { $( "#myDiv" ).show(); } Note that it isn't always necessary to test whether an element exists. The following code will show the element if it exists, and do nothing (with no … Continue reading

How do I select elements when I already have a DOM element?

If you have a variable containing a DOM element, and want to select elements related to that DOM element, simply wrap it in a jQuery object. 1 2 3 var myDomElement = document.getElementById( "foo" ); // A plain DOM element. $( myDomElement ).find( "a" ); // Finds all anchors inside the DOM element. Many people … Continue reading

How do I pull a native DOM element from a jQuery object?

A jQuery object is an array-like wrapper around one or more DOM elements. To get a reference to the actual DOM elements (instead of the jQuery object), you have two options. The first (and fastest) method is to use array notation: 1 $( "#foo" )[ 0 ]; // Equivalent to document.getElementById( "foo" ) The second … Continue reading

How do I disable/enable a form element?

You can enable or disable a form element using the .prop() method: 1 2 3 4 5 // Disable #x$( "#x" ).prop( "disabled", true ); // Enable #x$( "#x" ).prop( "disabled", false );

How do I determine the state of a toggled element?

You can determine whether an element is collapsed or not by using the :visible and :hidden selectors. 1 2 3 var isVisible = $( "#myDiv" ).is( ":visible" ); var isHidden = $( "#myDiv" ).is( ":hidden" ); If you're simply acting on an element based on its visibility, just include :visible or :hidden in the selector … Continue reading

How do I get the text value of a selected option?

Select elements typically have two values that you want to access. First there's the value to be sent to the server, which is easy: 1 2 $( "#myselect" ).val();// => 1 The second is the text value of the select. For example, using the following select box: 1 2 3 4 5 6 7 <select … Continue reading

Additional jQuery Support

While we hope to cover most jQuery-related topics on this site, you may need additional or more immediate support. The following resources can prove useful. link Official Forumshttp://forum.jquery.com/ There are many subforums where you can discuss jQuery, ask questions, talk about JavaScript, or announce your plugins. Getting Started This is the best place to post … Continue reading

Using the classes Option

As of the 1.12 release, the jQuery UI widget factory includes a means of managing CSS class names through the classes option. This article will give you an overview of how the classes option works, and discuss what you can do with it. link Syntax overviewThe classes option is used to map structural class names … Continue reading